Molybdenum Rod Product Categories by Material and Surface Processing
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How Molybdenum Rods Are Categorized
Molybdenum rods are produced in a range of material grades and surface conditions to serve different high-temperature applications, such as heating elements, electrodes, glass melting components, furnace parts and electrical contacts. Understanding the categories helps buyers match the rod to the operating temperature, atmosphere and mechanical requirements of their process.
Categories by Material Composition
| Category | Key Composition | Typical Feature |
|---|---|---|
| Pure molybdenum rod | Mo greater than 99.95% | Standard high-temperature performance |
| High-temperature molybdenum rod (lanthanum-molybdenum) | La2O3 0.4-1.2% | Improved high-temperature strength and recrystallization resistance |
| TZM molybdenum rod | Ti 0.4-0.6%, Zr 0.07-0.12%, C 0.01-0.05% | Higher creep strength for demanding service |
Categories by Surface Processing
| Category | Surface Characteristic | Typical Use |
|---|---|---|
| Sintered molybdenum rod | Silver-gray metallic luster | General furnace and electrode applications |
| Forged molybdenum rod | Dark black surface with oxide layer | Structural and forming applications |
| Turned molybdenum rod | Metallic luster, smooth but slightly rough | Precision machining blanks |
| Polished molybdenum rod | Bright, smooth surface, small dimensional error | Precision components and contacts |
Polishing reduces surface roughness through mechanical, chemical or electrochemical action, producing a bright, smooth rod suitable for applications where surface quality matters.
Typical Specifications and Tolerances
Common product sizes range from 0.4 mm to 100 mm in diameter. Custom products can be manufactured to drawings with a tolerance of about plus or minus 0.05 mm. The density of standard molybdenum rod is approximately 10.2 g/cm3, close to the theoretical density of molybdenum, and the finished surface shows a silver metallic luster in polished condition.
Selecting the Right Rod Category
For standard furnace service, pure molybdenum rod is usually sufficient.
For very high temperature and cyclic loading, lanthanum-molybdenum rod offers better stability.
For the most demanding structural service, TZM rod provides the highest strength.
For precision parts, specify polished rod with tight diameter tolerance.
FAQ
Q1: What are the main material categories of molybdenum rod? Pure molybdenum rod, high-temperature lanthanum-molybdenum rod and TZM alloy rod.
Q2: What is the purity of pure molybdenum rod? Molybdenum content is greater than 99.95%.
Q3: What is the difference between sintered, forged, turned and polished rods? They differ in surface condition: sintered shows silver-gray luster, forged has a dark oxide layer, turned is smooth but slightly rough, and polished is bright and precise.
Q4: What size range is available? Common diameters range from 0.4 mm to 100 mm, with custom sizes available to drawing with tolerance around plus or minus 0.05 mm.
Q5: What is the typical density of molybdenum rod? Approximately 10.2 g/cm3.
